新型小管稳流器结构参数设计与试验研究

为了研究新型小管稳流器的水力性能及其结构参数对水力性能的影响,取稳流器流道的7个结构参数作为因素,采用正交试验设计方法,制定了16组方案,在50~250 kPa等6个不同工作压力下进行水力性能测试.结果表明16组试验方案下流道的流态指数为0.475~0.498,其水力性能良好.利用极差分析法,分析得知流道第2组分水板与过水板间距对流态指数的影响最大,第1组分水板与过水板间距对流态指数影响最小.应用多元线性回归分析,建立7个结构参数与流态指数之间的回归模型,方差分析表明其相关性良好;t检验显示,第1组分水板与边壁间距、第1组过水板中部过水孔径和第2组分水板与过水板间距对流态指数影响显著;同时验证试验表明,该回归模型计算值与试验值误差小于5%,能准确可靠地预测流态指数.

Geometric parameters design and experimental study of a new type drip emitter

The geometric parameters defining the flow passage of a new type drip emitter were selected to be design variables, and 16 cases were designed by using orthogonal experimental design method, and their hydraulic performance was tested at six operating pressures ranged in 50-250 kPa to identify the hydraulic characteristics and influences of these geometric parameters on them. The experimental results showed that the power, usually called flow regime index, in the flow rate-pressure relationships of 16 cases is in the range of 0.475-0.498, suggesting a rather good hydraulic performance. Based on range analysis on the results, it was found that the distance between the second baffle plate and the second orifice plate induces the greatest influence on the flow regime index, while the distance between the first baffle plate and the first orifice plate is responsible for the least influence. A regression model of the flow regime index with seven geometric parameters was established by employing multiple linear regression, and the followed analysis of variance showed that the correlation of the model is good. In terms of t-test, the distance between the first water baffle plate and the side wall, the central aperture of the first orifice plate and the distance between the second baffle plate and the second orifice plate have a significant effect on the flow regime index. Meanwhile, the verification test confirmed that the error between predictions and measurements is less than 5%. Thus, the flow regime index can be predicted accurately and reliably.